The Alcubierre Drive and Negative Energy

spock0149
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My understanding of the Alcubierre drive is that a spacecraft is encompassed within a 'bubble' of expanding spacetime (at rear of craft) and contracting spacetime (at the front).

I am trying to understand the role of negative energy in this scheme.

Am I correct in saying that the contracting spacetime at the front of the ship requires the negative energy, however that an equal amount of 'positive' energy is needed at the rear?

e.g with positive energy you only get half a warp drive...in a sense.
 
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